hypermedia system vs multimedia

hypermedia system and multimedia both are nouns.

Word	Noun	Adjective	Verb	Adverb
hypermedia system	Yes	No	No	No
multimedia	Yes	No	No	No

As nouns, multimedia is a hypernym of hypermedia system; that is, multimedia is a word with a broader meaning than hypermedia system:

hypermedia system: a multimedia system in which related items of information are connected and can be presented together
multimedia: transmission that combine media of communication (text and graphics and sound etc.)

Other hypernyms of hypermedia system include multimedia system.

hypermedia system (noun)	multimedia (noun)
a multimedia system in which related items of information are connected and can be presented together	transmission that combine media of communication (text and graphics and sound etc.)